Spectra™ Plus kit from 5 to 32 zones. Includes 1 SP4000 Central Board, bidirectional central of 4 zones (8 with ATZ), expandable to 32. 1 Small box (S-BOX), box with transformer and capacity for 12 VDC/7Ah battery (not included) and 1 K32LCD keyboard with 2-part LEDs.